anonymous

4 years ago

A gardener crosses tall true-breeding pea plants with short true-breeding ones. Tall plants are dominant to short ones. He collects the seeds to grow F1 plants and then allows them to self-pollinate to form an F2 generation. Which of the following describes the traits of the offspring correctly?

If the parental plants (P-generation) have the genotypes TT (tall) and tt (short), respectively, all the F1 plants will be tall heterozygotes (genotype Tt). Those Tt-plants will (statistically) have the following distribution of genotypes and phenotypes among their offspring (the F2 generation): 25% TT (tall homozygotes); 50% Tt (tall heterozygotes) and 25% tt (short homozygotes). In other words: 3/4 of the offspring will have the tall phenotype (genotypes TT and Tt); and 1/4 will be short plants (genotype tt). - Try a Punnett square to visualize the different crosses...